Art of printing



Filed Oct. 30, 1945 2 Sheets-Sheet 1 p 1950 1 N. D. HALL 2,520,928

ART 0E PRINTING INVENTOR. W ad, BY

P 1950 N. D. HALL 2,520,928

ART OF PRINTING Filed Oct. 30, 1945 2 Sheets-Sheet 2 Patented Sept. 5, 1950 UNITED STATES PATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 G. 757) '7 Claims.

The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes Without the payment to me of any royalty thereon in accordance with the provisions of the act of April 30, 1928 (Ch. 460, 45 Stat. L. 467) This invention relates to the art of printing and has for its object to provide a device for readily positioning and retaining perforating rules upon a foundation plate by means of rule clamps pivoted in eccentric plugs secured in orifices formed in the foundation plate.

The usual method of securing perforating rules to foundation plates does not permit locating the perforating rules in all desired positions, as the rules are more or less restricted by a lack of adjustability of the clamps. Therefore, in many cases it becomes necessary to improvise special clamping arrangements in order to locate the rule in the position desired.

An object of the invention is to eliminate the necessity for special devices for holding the rules in place in the foundation plates 'and to provide an attachment for mounting the rules where they are required by selecting for a plurality of such attachments the most convenient holes in the foundation plate and then securing a final adjustment by rotating and clamping an eccentric plug.

With these objects in view the invention consists of the construction and arrangement of parts of the eccentric plug and in certain other details and combinations of parts, all of which will first be fully described and afterwards specifically pointed out in the' appended claims.

Referring to the accompanying drawings:

Figure 1 is a fragmentary plan View of a perforated assembly of a foundation plate, a plurality of eccentric plugs and an attached perforating rule in operative position.

Figure 2 is an enlarged plan View of one of the eccentric plugs showing a perforating rule in clamped position therein.

Figure 3 is a horizontal sectional view through an eccentric plug taken on line 33 of Figure 7.

Figure 4 is an enlarged side elevation of one of the eccentric plugs with perforating rule in operative position.

Figure 5 is an elevation of a retaining screw for the post of a perforating rule clamp.

Figure 6 is a fragmentary vertical sectional view through a portion of the foundation plate and an eccentric plug and illustrating the eccentric plug in locked position within the founelation plate,

Figure 7 is a similar view illustrating the eccentric plug within the foundation plate in unlocked position.

Figure 8 is a horizontal sectional view through an eccentric plug in locked position within a foundation plate, taken on line 8-8 of Figure 6, and

Figure 9 is a similar view of an eccentric plug in unlocked position taken on line 99 of Figure '7.

Like numerals of reference indicate the same parts throughout the several figures in which I indicates the assembly as shown in Figure 1, which includes the foundation plate 2, eccentric plugs 3, perforating rule 4 and rule clamps 5.

The foundation plate 2 is provided with a plurality of vertical holes or perforations 6 formed therein, in diagonally arranged rows and equally spaced apart. It will be seen from Figures 6 and 7 that these holes 6 are formed of two diameters, the larger diameter 7 being below the smaller diameter B so that an offset 9 is formed at the juncture of the two diameters l and 8 within the holes 6.

It will also be seen that the eccentric plugs 3 (as in Fig. 4) are of uniform diameter throughout their lengths, which diameter is such that they form a slidin fit in the reduced upper portion or smaller diameter 8 of the holes in the foundation plate 2, as shown in Figures 6 and '7.

Each of the eccentric plugs 3 is provided eccentrically therein with a vertical hole II], as best shown in Figure 7, to receive the stem ll of the perforating rule clamp 5. As is usual in the art, the base 4 of the perforating rule 4 is slidably received in the clamp 5, as indicated by the construction shown in Figure 7.

In order to retain the stem ll of the clamp 5 against casual displacement and at the same time permit of unrestricted rotation of the stem H within the hole in, the stem H is provided with an annular groove or neck II to receive the reduced end 12 of a set screw 13, which is shown in Figures 5 and '7.

As shown in Figures 6 and 7, each eccentric plug 3 is provided with a recess or chamber l4 formed in one side thereof and extending substantially half-way through the plug 3, the location of this recess being opposite to the offset or shoulder 9 in the hole 6 of the foundation plate 2, while the size of this chamber M in a vertical direction is such that part thereof is above the said offset or shoulder 9 and part thereof is below it.

In communication with this recess or chamber is from the top face of each eccentric plug 3 is a tapped hole I 5 which receives a set screw it provided with a reduced square end It which enters a square opening IT in a locking cam ll.

As will be seen from Figures 8 and 9, this locking cam H has a thin cam shaped flange H", which when the cam is rotated by the set screw I5 is carried under the offset or shoulder 9 in the hole 6 of the foundation plate 2, and into looking contact with the wall of the said hole 6, so as to lock the eccentric plug 3 against rotation in said hole, Rotation of the set screw it and the locking cam I7 is effected by a square set-screw wrench 58 inserted in a square opening in the set screw it.

The locking cam If is inserted in the recess or chamber 54 in the eccentric plu 3, and in order to retain the locking cam in proper operative position after receiving the square end [6 of the set screw i6, a supporting filler plate l9 which is shaped to the contour of the said recess or chamber 54, is inserted in said chamber or recess under the locking cam ii and is held in this position by a retainin screw I9 which passes through the filler plate l9 and threads into the eccentric plug 3, as shown in Figures 6 and '7.

When it is desired to remove or adjust the eccentricplugs 3, their locking cams H are rotated from their locking positions, shown in Figures 6 and 8, into their unlocked positions, shown in Figures 7 and 9. This permits the eccentric plugs 3 to be freely rotated in the foundation plate 2 or be bodily removed therefrom, as may be desired.

Having thus described the invention, I do not wish to be understood as limitin myself to the exact construction shown and described, as various changes may be made in the construction and arrangement of the parts, and I consider myself clearly entitled to all such changes and modifications as fall within the limit and scope of the appended claims.

What is claimed is:

1. In the printing art, a device for readily positioning and retaining perforating rules, which includes, in combination with a perforated foundation plate, a plurality of plugs for rotary movement in selected perforations in said foundation plate, each of the said plugs being provided with an eccentrically positioned hole, a rule clamp and stem rotatably mounted in said hole, means for retaining the clamp stem against casual displacement in its hole, each plug being provided with a chamber formed in the side thereof and each perforation in the foundation plate being provided with an annular shoulder opposite to the said chamber in the plug, a locking cam disposed in the chamber of the plug, a rotatable element in the top of the plug and having means for interlocking engagement with the said looking cam so that upon rotation of the rotatable element the said cam will be moved into engagement with the wall of the perforation in the foundation plate and under the said annular shoulder in the perforation to lock the plug against rotation in its perforation, and a filler plate disposed in the chamber in the plug and under the said locking cam.

2. In the printin art, a device for readily positioning and retaining perforating rules, which includes, in combination with a perforated foundation plate, a plurality of plugs for rotary movement in selected perforations in the foundation plate, each of the said plugs being provided with an eccentrically positioned hole, a rule clamp 4 and stem rotatably mounted in said hole, means for retaining the clamp stem against casual displacement in its hole, each plug being provided with a chamber formed in the side thereof and each perforation in the foundation plate being provided with an annular shoulder opposite to the said chamber in the plug, a locking cam disposed in the chamber of the plug, a rotatable element in the top of the plug and havin means for interlocking engagement with the said looking cam so that upon rotation of the rotatable element the said cam will be moved into engagement with the wall of its perforation in the foundation plate and under the said annular shoulder in the perforation to lock the plu against rotation in its perforation.

3. In the printing art, a device for readily positioning and retaining perforating rules, which includes, in combination with a foundation plate provided with perforations, each having an annular shoulder therein, a plurality of plugs for rotary movement in selected perforations in the foundation plate, each of the said plugs being provided with a chamber formed in the side thereof, a locking cam disposed in the chamber of the plug, a rotatable element in the top of the plug and having means for interlocking engagement with the said locking cam so that upon rotation of the rotatable element the said cam will be moved into engagement with the wall of its perforation in the foundation plate and under the annular shoulder therein to lock the plug against rotation and upward displacement in its perforation and a rule clamp provided with a stem revolubly mounted in a, hole eccentrically located in each of said plurality of plugs.

l. In the printing art, a device for readily p0- siticning and retaining perforating rules, which includes, in combination with a foundation plate provided with perforations, each having an annular shoulder therein, a plurality of plugs for r0- tary movement in selected perforations in the foundation plate, each of the said plugs being provided with a chamber formed in the side thereof, a locking cam disposed in the chamber of the plug and means for rotating the cam into engagement with the wall of its perforation in the foundation plate and under the annular shoulder therein to lock the plug against rotation and upward dis lacement in its perforation and a rule clamp provided with a stem revolubly mounted in a hole eocentrically located in each of said plurality of plugs.

5. the printing art, a device for readily p0- sitioning and retaining perforating rules, which includes, in combination with a foundation plate provided with perforations, each having an annular shoulder therein, a plurality of plugs for rotary movement in selected perforations in the foundation plate, a locking cam disposed within the plug and means for moving the locking cam into engagement with the wall of its perforation in the foundation plate and under the annular shoulder therein to lock the plug against rotation and upward displacement in its perforation and a rule clamp provided with a stem revolubly mounted in a hole eccentrically located in each of said plurality of plugs.

6. A printing plate attachment for detachably mounting perforating rules on a foundation plate provided with a plurality of holes each hole having a retaining shoulder, the improvement which includes a provided with an eccentrically positioned hole, a second'threaded-stein receiving hole and a laterally open recess in said plug forming an enlarged extension of said second hole, a rule clamp stem rotatably retained in said first hole, a set screw provided with a non-circular downwardly extending end and an upwardly open non-circular hole, mounted in said threaded hole, a locking cam adapted to receive said non-circular end of said set-screw and to be operated thereby for engagement under a shoulder of said foundation plate, and a cam-retaining filler plate'removably secured within said lateral- 1y open recess.

7. A printing plate attachment for detachably mounting perforating rules on a foundation plate provided with a plurality of holes each hole having a retaining shoulder, the improvement which includes a plug provided with an upwardly open eccentrically positioned hole, a threaded stemreceiving hole and an enlarged laterally open recess forming an extension of said threaded hole, a rule clamp provided with a stem revolubly mounted in said first hole, means for detachably retaining said stem in said plug, a set-screw provided with a non-circular downwardly extending REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,542,315 Noell June 16, 1925 1,867,805 Brugmann July 19, 1932 2,224,555 Sweet Dec. 10, 1940 FOREIGN PATENTS Number Country Date 460,524 Great Britain of 1937 

